feat: introduce WebSocket sync for XBoard nodes

- Implement Workerman-based `xboard:ws-server` for real-time node synchronization.
- Support custom routes, outbounds, and certificate configurations via JSON.
- Optimize scheduled tasks with `lazyById` to minimize memory footprint.
- Enhance reactivity using Observers for `Plan`, `Server`, and `ServerRoute`.
- Expand protocol support for `httpupgrade`, `h2`, and `mieru`.

app/Observers/ServerObserver.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Observers;
+
+use App\Models\Server;
+use App\Services\NodeSyncService;
+
+class ServerObserver
+{
+    public function updated(Server $server): void
+    {
+        if (
+            $server->isDirty([
+                'group_ids',
+            ])
+        ) {
+            NodeSyncService::notifyUsersUpdatedByGroup($server->id);
+        } else if (
+            $server->isDirty([
+                'server_port',
+                'protocol_settings',
+                'type',
+                'route_ids',
+                'custom_outbounds',
+                'custom_routes',
+                'cert_config',
+            ])
+        ) {
+            NodeSyncService::notifyConfigUpdated($server->id);
+        }
+    }
+
+    public function deleted(Server $server): void
+    {
+        NodeSyncService::notifyConfigUpdated($server->id);
+    }
+}